According to a Roblox Status Twitter account, which is not affiliated with Roblox, users attempting to log into the website were receiving 400 and runtime errors.

— Roblox (@Roblox) October 31, 2021 In the event the game is experiencing some errors or server-side problems, various features and services may be impacted.

12:44, Sat, Oct 30, 2021 Updated: 14:13, Sat, Oct 30, 2021 Roblox, which boasts more than 43.2 million daily active users worldwide, is suffering a major outage across the United States, the UK ...

It even tracks Roblox Studios. The server status page updates frequently, so you will also have the most recent activity show up every few seconds.